Shoe pad boxes



March 21, 1961 Filed March 2, 1959 F. DAWSON 2,975,442

SHOE PAD BOXES 3 Sheets-Sheet 1 122129811502 7 Fwed. 0w s w,

March 21, 1961 DAWSON 2,975,442

SHOE PAD BOXES Filed March 2, 1959 3 Sheets-Sheet 2 lave-11303 Ffled .Dawsaw,

uifioflzzeg March 21, 1961 DAWSON 2,975,442

SHOE PAD BOXES Filed March 2, 1959 3 Sheets-Sheet 3 SHOE PAD BOXES Fred Dawson, West Roxbury, Mass, assignor to Compo Shoe Machinery Corporation, Waltham, Mass., a corporation of Delaware Filed Mar. 2, 1959, Ser. No. 796,373

Claims. (CI. 1238) This invention relates to pad boxes used in the cementing of shoe soles to shoe uppers and to the front faces of shoe heels.

. In the manufacture of some types of womens shoes, a heel is placed directly on a shoe bottom, and a properly prepared sole is pressed and cement fastened not only to the forepart and shank areas of the shoe bottom, but to the front face of the heel. The application of the proper pressure to accomplish this without displacing or removing the heel has required considerable skill and effort.

This invention provides a pad box which applies concentrated pressure against a sole portion on the front face of a heel as well as to the contours of the shank and forepart portions of the sole, and which automatically supports the heel at its rear so that the pressure applied to its front face can not deflect or remove the heel.

.Another advantage of the pad box of this invention is its ability to take the full variety of heel heights and heel types which may be encountered in shoe factories, without the requirementsof adjustments of or modifica; tions of the pad box.

An object of this invention is to improve the quality United tates Patent to a sole portion against the front face of a heel while supporting the rear of the heel. Another object of this invention is 'to apply balanced pressures to the front and rear faces of a heel.

This invention will now be described with reference to the annexed drawings, of which:

Fig. 1 is a plan view looking downwardly upon a pad box embodying this invention, with its rubber diaphragms uninflated.

'Fig. 2 is a side view, partially in section, of the box before inflation of its diaphragms;

Fig. 3 is a plan view corresponding to Fig. l, but with a shoe shown on the leather panels of the pad box, and with its diaphragms inflated;

Fig. 4 is a section along the line 4-4 of Fig. 3;

Fig. 5 is a section along the line 5-5 of Fig. 4; and

Fig. 6 is a side view similar to Fig. 2 except that it is not in section.

A forepart pad box casing 10 has clamped thereto by a generally semi-elliptical ring 11 and bolts 12, and by a pair of side clamps 13 and bolts 14, the edge portions of a rubber diaphragm 15 and of an overlying leather panel 16. The panel 16 is slitted along lines 17 to form a generally rectangular flap 18, and between this flap 18 and the diaphragm 15 is a rubber wedge 20. An inflation chamber 21 between the diaphragm 15 and a bottom surface 9 of the casing 10, is connected through fitting 22 and tube 23 to a source of compressed air which is not shown.

A heelpart pad box casing 10A has clamped thereto by a ring section 25 attached to the casing 10 by bolts 28 and 28A, a folded-over rubber diaphragm 27. The

upper end of a leather panel 30 is removably attached by snaps 26 to the top of the ring section 25, and the upper surface of its lower portion is cemented to the lower surface of a rubber wedge 31. The upper end of another leather panel 33 extends over the upper end of the panel 30, and is attached to the top of the ring section 25 by screws 32. The lower portion of the panel 33 overlies the wedge 31 and an upper portion of the diaphragm 27 below the wedge 31. v

The wedge 31 and the panel 30 to which it is cemented are removable as a unit, and can be replaced by similar units having different wedge thicknesses and shapes to accommodate different types and heights of heels.

As shown by Figs. 2, 5 and 6, the forepart casing 10, the ring section 25 and the heelpart casing 10A are secured together by bolts 28A at the sides and by bolts 14 in the center. The side and top portions of the diaphragm 27 are clamped between the casing 10A and the ring section 25. The rear edge portions of the diaphragm 15 and the leather panel 16 are clamped between the ring section 25 and the forepart casing 10.

Inflation chamber 34' between the folds of the diaphragm 27 is connected by fitting 36, tube 37 and fitting 38 with the inflation chamber 21.

Figs. 3 and 4 show. a shoe 40 .on a last 41, with heel and toe posts 42 and 43 respectively, holding the shoe in position on the leather panels ofthe pad box, with the diaphragms 15 and 27 inflated. Shoe sole 44 has a flap portion 45 against the frontface of the heel 46, with previously applied cement therebetween. The shank and forepart of the sole 44 also have previously applied cement between their upper surfaces and the shoebottom.

The wedge 20 is located below the shank portion of the shoe adjacent to the front face of the heel. The wedge 31 is located at the rear of the heel.

The pad box of this invention is designed to be used with a shoe press such as is shown in the copending application of John F. Smith, Serial No. 577,687, filed April 12, 1956, now Patent No. 2,924,836 granted February 26, 1960. In such a press, the pad box is moved up until the shoe sole and heel are brought in full contact with the upper surfaces of the panels 16 and 33 before air is admitted into the pad box to inflate its diaphragms. This contact is achieved by the separate diaphragms 15 and 27, wedges 20 and 31, and panels 16 and 33.

When the diaphragms 15 and 27 are inflated, the shank and forepart portions of the shoe sole are forced at the proper pressure against the corresponding portions of the shoe bottom, and the wedge 20 is deformed as shown by Fig. 4 to press the flap portion 45 of the sole against the front face of the heel 46. Since the inflation chamber 21 under the diaphragm 15, and the inflation chamber 34 between the folds of the diaphragm 2-7 are connected by the tubing 37, compressed air supplied into the inflation chamber through the tube 23, flows into the inflation chamber 34 through the tubing 37. The air pressures in the two inflation chambers are therefore balanced. The air pressure in the inflation chamber 34 causes the diaphragm 27, panel 30, wedge 31 and panel 33 to exert a pressure against the rear face of the heel 46, opposing the pressure exerted against the front face of the heel by the inflated diaphragm 15, the wedge 20 and the panel flap 18.

Since in many instances, heels are only temporarily attached by a thermoplastic or hot melt adhesive during this type of sole attaching, it is highly important that as accomplished by this invention, that the forces applied to the front and rear faces of the heel be balanced for preventing the heel from being displaced or removed by the pressure applied to the front face of the heel for pressing the sole flap portion 45 thereagainst.

'What is claimed is:

l. A shoe pad box comprising a forepart casing having a first inflatable diaphragm and a leather panel overlying said diaphragm .for applying pressure, to the shank portion of a shoe and to the front face of the heel of the shoe, a heel port casing having a second inflatable diaphragm and a second leather panel overlying said second diaphragm for applying pressure to the rear face of said heel, common means for clamping said casings together, and for clamping edge portions of said first diaphragm and said first mentioned panel to said forepart casing and edge portions of said second diaphragm to said heel partcasing, means for supplying compressed air to inflate one of said diaphragms, and means connecting said diaphragms for supplying compressed air from said one diaphragm to inflate the other of said diaphragms.

2. A shoe pad box comprising a first inflatable diaphragm, a leather panel overlying said diaphragm, said panel having a portion for applying pressure to the shank portion of a shoe, and having another portion for applying pressure to the front face of the heel of the shoe, a resilient wedge between said diaphragm and said panel portions, means including a second inflatable diaphragm and a second leather panel overlying said second diaphragm for applying pressure to the rear face of said heel, means for supplying compressed air to inflate one of said diaphragms, and means connecting said diaphragms for supplylng'compressed air from said one diaphragm to inflate the other of said diaphragms.

3. A shoe pad box comprising a first inflatable diaphragm, a leather panel overlying said diaphragm, said panel having a portion for applying pressure to the shank portion of a shoe, and having another portion for applying pressure to the front face of the heel of the shoe, a resilient wedge between said diaphragm and panel portions, a second inflatable diaphragm spaced rearwardly of said first diaphragm, a second leather panel for applying pressure against the rear face of said heel, overlying said second diaphragm, a resilient wedge between said second diaphragm and said second panel, means for supplying compressed air to inflate one of said diaphragms, and means connecting said diaphragms for supplying compressed air from said one diaphragm to inflate the other of said diaphragms.

4. A shoe pad box comprising a first inflatable diaphragm, a leather panel overlying said diaphragm, said panel having a portion for applying pressure to the shank portion of a shoe, and having another portion for applying pressure to the front face of the heel of the shoe, a resilient wedge between said diaphragm and panel portions, a second inflatable diaphragm spaced rearwardly of said first diaphragm, a second leather panel for applying pressure against the rear face of said heel, a third leather panel between said second'diaphragm and said second panel, a resilient wedge between said second and third panels, means for supplying compressed air to inflate one of said diaphragms, and means connecting said diaphragms for supplying compressed air from said one diaphragm to inflate the other of said diaphragms.

5. A shoe pad box comprising a casing having a bottom surface, an inflatable diaphragm spaced from said surface, a leather panel overlying said diaphragm and having an edge portion in contact with a corresponding edge portion of said diaphragm, means for clamping said edge portions to said casing, said panel having a portion for applying pressure to a shank of a shoe and having another portion for applying pressure to the, front face of the heel of said shoe, a resilient wedge between said diaphragm and said panel portions, a second, folded-over,

inflatable diaphragm spaced rearwardly of said diaphragm and having upper contacting edges, a second leather panel overlying an upper portion of said second diaphragm, a third leather panel overlying said second panel, a resilient wedge between said second and third .panels, means for securing said upper edges of said second diaphragm and the upper edges of said second and third panels to said casing, means for supplying compressed air into the space between said bottom surface and said first mentioned diaphragm to inflate said first mentioned diaphragm, and means connecting said space and the space between the folds of said second diaphragm for supplying compressed air from said first mentioned space to said space between said folds for inflating said second diaphragm.

References Cited in the file of this patent UNITED STATES PATENTS 2,058,446 Haselier Oct. 27, 1936 FOREIGN PATENTS V I 1,168,417 France Sept. 1, 1958 

